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Explicit Subscriptions for the REFER Method (RFC7614)

IP.com Disclosure Number: IPCOM000242889D
Original Publication Date: 2015-Aug-01
Included in the Prior Art Database: 2015-Aug-27
Document File: 28 page(s) / 32K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Sparks: AUTHOR

Abstract

REFER, as defined by [RFC3515], triggers an implicit SIP-Specific Event Framework subscription. Sending a REFER within a dialog established by an INVITE results in dialog reuse and the associated problems described in [RFC5057]. The SIP-Specific Event Notification framework definition [RFC6665] disallows such dialog reuse. Call transfer, as defined in [RFC5589], thus requires sending a REFER request on a new dialog, associating it with an existing dialog using the 'Target-Dialog' mechanism defined in [RFC4538].

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Internet Engineering Task Force (IETF)                         R. Sparks Request for Comments: 7614                                        Oracle Category: Standards Track                                    August 2015 ISSN: 2070-1721

               Explicit Subscriptions for the REFER Method

Abstract

   The Session Initiation Protocol (SIP) REFER request, as defined by    RFC 3515, triggers an implicit SIP-Specific Event Notification    framework subscription.  Conflating the start of the subscription    with handling the REFER request makes negotiating SUBSCRIBE    extensions impossible and complicates avoiding SIP dialog sharing.    This document defines extensions to REFER that remove the implicit    subscription and, if desired, replace it with an explicit one.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7614.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Sparks                       Standards Track                    [Page 1]
 RFC 7614              REFER Explicit Subscriptions           August 2015

 Table of Contents

   1. Introduction ....................................................3

   2. Conventions .....................................................3

   3. Overview ........................................................4

      3.1. Explicit Subscriptions .....................................4

      3.2. No Subscriptions ...........................................5

   4. The Explicit Subscription Extension .............................5

      4.1. Sending a REFER .....................................